file.js

'use strict'

const pino = require('./pino')
const { once } = require('events')

module.exports = async function (opts = {}) {
  const destination = pino.destination({ dest: normalizeDest(opts.destination || 1), sync: false })
  await once(destination, 'ready')
  return destination
}

function normalizeDest (destination) {
  const fd = Number(destination)
  if (typeof destination === 'string' && Number.isFinite(fd)) {
    return fd
  }
  return destination
}